JPA support for Java 8 new date and time API

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For Hibernate 5.X just add

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-java8</artifactId>
        <version>${hibernate.version}</version>
    </dependency>

and 

@NotNull
@Column(name = "date_time", nullable = false)
protected LocalDateTime dateTime;

will work without any additional effort.
See https://hibernate.atlassian.net/browse/HHH-8844

UPDATE:

Please have a look at Jeff Morin comment: since Hibernate 5.2.x it is enough

 <dependency>
     <groupId>org.hibernate</groupId>
     <artifactId>hibernate-core</artifactId>
     <version>5.2.1.Final</version>
 </dependency>
 <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-...</artifactId>
     <version>4.3.1.RELEASE</version>
 </dependency>

See https://github.com/hibernate/hibernate-orm/wiki/Migration-Guide—5.2 and
Integrate Hibernate 5.2 with Spring framework 4.x

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